Dell Precision 450 - Manual (Page 73)

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Ergonomic Computing Habits
Dell Precision™ Workstation 450 and Dell Precision Workstation 650 User's Guide
For comfort and efficiency, observe the following ergonomic guidelines when setting up and using your computer:
l Position your computer so that the monitor and keyboard are directly in front of you as you work. Special shelves are available (from Dell and other
sources) to help you correctly position your keyboard.
l Set the monitor at a comfortable viewing distance (usually 510 to 610 millimeters [20 to 24 inches] from your eyes).
l Make sure the monitor screen is at eye level or slightly lower when you are sitting in front of the monitor.
l Adjust the tilt of the monitor, its contrast and brightness settings, and the lighting around you (such as overhead lights, desk lamps, and the curtains or
blinds on nearby windows) to minimize reflections and glare on the monitor screen.
l Use a chair that provides good lower back support.
l Keep your forearms horizontal with your wrists in a neutral, comfortable position while using the keyboard or mouse.
l Always leave space to rest your hands while using the keyboard or mouse.
l Let your upper arms hang naturally at your sides.
l Sit erect, with your feet resting on the floor and your thighs level.
l When sitting, make sure the weight of your legs is on your feet and not on the front of your chair seat. Adjust your chair's height or use a footrest, if
necessary, to maintain proper posture.
l Vary your work activities. Try to organize your work so that you do not have to type for extended periods of time. When you stop typing, try to do things
that use both hands.
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CAUTION: Improper or prolonged keyboard use may result in injury.
CAUTION: Viewing the monitor screen for extended periods of time may result in eye strain.
1 monitor screen at or below
eye level
2 monitor and keyboard
positioned directly in front
of the user
3 monitor stand
4 feet flat on the floor
5 arms at desk level
6 wrists relaxed and flat